Iran took a leading role in the Iraqi military’s largest offensive yet to reclaim territory from Islamic State, throwing drones, heavy weaponry and ground forces into the battle while the U.S. remained on the sidelines.

The Supreme Court Wednesday will hear oral arguments on a challenge to subsidies received by millions of Americans who purchased health insurance through a federally run exchange. The suit represents one of the biggest threats to the law.

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Costco named Citigroup and Visa as its new credit partners, replacing American Express as the exclusive network at its stores beginning in April of next year. The deal will expand the type of plastic that is accepted at the chain.

The results of an internal investigation into accounting irregularities at American Realty Capital Properties came as a relief to shareholders, as the troubled real-estate investment trust reported a clean bill of health for its property portfolio.

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In photos selected Monday by Wall Street Journal editors, rescue workers put out a fire in South Africa, rebel fighters in Syria take positions on the front line, men play shuffleboard in Florida and more.

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